IP65 vs IP67 Outdoor Lighting: Ratings Explained
· NEON team
What IP65, IP66 and IP67 ratings mean for outdoor LED lighting, which rating each application needs, and how sealing affects lifespan.
IP ratings are two numbers doing two jobs, and most buyers read them as one score. That leads to both overspending — IP68 fittings where IP65 would do — and failures, because the rating people actually order is often not the rating the installation needs.
The two digits mean different things
An IP rating is written IPXY:
- First digit (X) — solids. 0 to 6. In practice, any rating above IP5X is dust-protected, and IP6X is dust-tight.
- Second digit (Y) — liquids. 0 to 9K. This is the one that decides outdoor survival.
So IP65 and IP67 have the same solids protection. The difference is entirely about water.
What each liquid digit actually means
| Rating | Protection | Test condition |
|---|---|---|
| IPX4 | Splashing water | Water sprayed from any direction, limited pressure |
| IPX5 | Water jets | 6.3 mm nozzle, 12.5 L/min from any direction |
| IPX6 | Powerful water jets | 12.5 mm nozzle, 100 L/min from any direction |
| IPX7 | Temporary immersion | 30 minutes at 1 m depth |
| IPX8 | Continuous immersion | Depth and duration agreed between manufacturer and user |
The key point for outdoor lighting: IPX7 is not a graded “better” version of IPX6. They test different things. A fitting rated IPX7 has been immersed in still water; a fitting rated IPX6 has been blasted with a high-pressure jet. A fitting can genuinely pass one and fail the other.
Which rating each application needs
| Application | Minimum | Reasoning |
|---|---|---|
| Sheltered outdoor, covered soffits | IP44–IP54 | Rain rarely reaches the fitting directly |
| General exterior, garden, landscape | IP65 | Water jets from cleaning and driving rain |
| Street lighting, parking lots | IP66–IP67 | Spray from vehicles, pressure washing, standing water |
| Areas with temporary flooding | IP67 | Roadside drains, low-level installations |
The most common specification mistake is putting an IP65 fitting on street furniture where maintenance teams pressure-wash. IPX5 tests a 6.3 mm nozzle at 12.5 L/min. A commercial pressure washer delivers several times that. IP66 or IP67 is the honest requirement there.
Sealing is a system, not a housing
A fitting rated IP67 at the factory does not stay IP67 if it is installed badly. Three failure points cause the majority of water ingress we see in field returns:
- Cable glanding — an under-tightened or incorrectly sized gland is the single most common cause. The rating covers the housing, not the electrician’s work.
- Breathable vents — some fittings use a GORE-type vent to equalise pressure. If it is blocked by paint or debris, condensation accumulates.
- Gasket compression — re-sealing a fitting repeatedly during installation flattens the gasket. Tell installers to open the housing once, not three times.
This is why a higher IP rating is not a substitute for installation quality, and why a supplier who asks about installation conditions is worth listening to.
How failing seals cause failures faster than water
The mechanism is worth knowing because it explains the symptom pattern. Water ingress rarely kills an LED directly. It kills the driver, typically by corrosion, and often weeks after the water entered. The LEDs keep working while the driver fails, so the problem is reported as “the fitting died immediately” when the ingress event was a month earlier.
A fitting specified below its environment will therefore fail in a cascade starting some weeks into the wet season — not on day one. If a batch of failures appears suddenly after heavy rain, sealing is the first thing to check.
Practical guidance
- Match the rating to the installation, not to the marketing. Higher IP costs more machining, better gaskets and better glands.
- Ask what the water test condition was. “IP67” without an immersion duration or depth is incomplete.
- Remember the installation. Include glanding instructions with the goods and check them on the first installation.
- Do not confuse IP with impact or corrosion resistance. A salt-spray environment needs attention to housing material and finish, which IP does not measure.
Products referenced in this guide
300W LED Flood Light, IP67, 30W–400W Range
IP67 aluminium flood light in a 30W–400W range with remote control, dimming, 120° beam angle and Ra 95 colour rendering.
- MOQ 1 pcs
Moon Style LED Street Light, IP67, 60W–400W
IP67 street light with a 60W–400W module range, customised to your pole design for roads, highways, sidewalks and squares.
- MOQ 2 pcs
Solar Garden Light, LiFePO4 Battery, IP67
IP67 solar garden light with LiFePO4 battery, Epistar SMD chip and dual light-control plus remote operation.
- MOQ 2 pcs
Solar LED Flood Light, 150W–3000W, IP67
IP67 solar flood light, DC 6V, 10,000–11,000 lm at 100 lm/W with remote control, dimming and a 3-year warranty.
- MOQ 2 pcs